18993316 has 12 divisors (see below), whose sum is σ = 33269040. Its totient is φ = 9487880.

The previous prime is 18993313. The next prime is 18993319. The reversal of 18993316 is 61339981.

It is an interprime number because it is at equal distance from previous prime (18993313) and next prime (18993319).

It is not an unprimeable number, because it can be changed into a prime (18993313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6495 + ... + 8953.

It is an arithmetic number, because the mean of its divisors is an integer number (2772420).

It is a vampire number, since it can be written as 1931 ⋅ 9836 (with its own digits).

Almost surely, 2^18993316 is an apocalyptic number.

It is an amenable number.

18993316 is a deficient number, since it is larger than the sum of its proper divisors (14275724).

18993316 is a wasteful number, since it uses less digits than its factorization.

18993316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4394 (or 4392 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 18993316 is about 4358.1321687163. The cubic root of 18993316 is about 266.8088706819.

The spelling of 18993316 in words is "eighteen million, nine hundred ninety-three thousand, three hundred sixteen".